animation_clip
Files live in animations/. Used by animation · library.
heightfield
Files live in terrain/. Used by collider2d · heightfield, collider3d · heightfield.
material
Files live in materials/. Used by mesh · material, shape2d · material, shape3d · material, sprite · material.
mesh
Files live in models/. Used by collider2d · mesh, collider3d · mesh, mesh · source, polygon · mesh, shape2d · mesh.
tileset
Files live in tilesets/. Used by tilemap · tileset.
voxels
Files live in terrain/. Used by collider3d · voxels.